160 = 2 × 2 × 2 × 2 × 2 × 5

170 = 2 × 5 × 17

90 = 2 × 3 × 3 × 5

We know, LCM is calculated as product of unique divisors of no’s

Here,

Lcm = 2 × 2 × 2 × 2 × 3 × 3 × 5 × 17

= 12240